Taximeter



F. H.CLAUSE Sept. 20; 1932.

TAXIMETER Filed June 27. 1930 2 ShQGtS-ShGGt l Sept. 20, 1932. F. H.CLAUSE 1,378,438

TAXIMETER Filed June 27, 1930 2 Sheets-Sheet 2 INVENTOR Patented Sept.20, 1932 UNITED STATES PATENT OFFICE FRANK HAROLD CLAUSE, OFCALIBER-WELL, LONDON, ENGLAND, ASSIGNOR TO WADDINGTON TAMPERPROOFTAXIMETERS, LIMITED, OF LONDON, ENGLAND TAXIMETER Application filed:June 27, 1930, Serial No. 464,288, and in Great Britain July 25, 19291This invention relates to improvements in taximeters, andmoreparticularly to the road wheel and clock drive therefor.

In taximeter construction, the indicating and recording mechanisms areusually operated by a pawl on a lever engaging a hub wheel'which isdriven by ratchet and pawl mechanisms, in turn driven by trains ofwheels from the cab roadwheel and from a clock. The ratchet operated bythe train which is moving at the slower rate overruns its pawl, and thepawls are therefore frequently in such a position with respect to thedriving surfaces of the teeth of the ratchet that there is anappreciable lag before the pawl moves into engagement with the drivingsurface. Back lash or slack is thus present in the road driveand theclock trains of wheels, as the carriers of the pawls are carriedforward. by friction. This back lash and lag in the drive results,especially in traflic congested areas, in an appreciable loss tov thetaxicab proprietors, frequently amounting to 10% of the true. fare,since during the time that the lag or back lash is being taken up, thedrive from the road wheel; train or the clock is not transmitted to theindicators to increase the value of their indication.

The object of this invention is toobviate orminimize the loss usuallyincurred in taximeters, due to lag and back lash between the variouspartsv of the driving mechanism, while yet employing arts which caneasily andcheaply be manu actured and assembled without undue regard forextreme accuracy.

Thetprinciple employed is the maintenance of contact between driven anddriving members by means of springs. The method i adopted can be varied.In the case of the clock drive the back lash. is considerably reduced bydeep meshing with fine (i. e. closely pitched.) teeth on the gear wheelsand entirely obviated when the driven wheels are kept in enga ement withthe driving wheels by springs. ine teeth have hitherto seldom beenemployed, since they necessitate very accurate mounting of the wheels ontheir spindles and pivots in order. to avoid too deep meshing of,thegear wheels which might springing.

stop the clock, or shallow meshing which would increase the carryforward by tion previously referred to. The method according to thisinvention of springing the driven wheels into the driving wheels makesdeep meshing possible without great accuracy in mounting.

In place of the ratchet and pawl mechanism the driven members aremaintained in constant contact with the driving members by spring-urgeddrive transmitting interme, diates.

' In the road drive train the gearingsometimes includes a worm and wormwheel and sometimes a bevel and crown wheel; The torsion ofthe usualflexible shaft drive main.- tains the train without slack up to-the wormor bevel wheel and maintains without slack part of the train Whereordinary gearing is used. In this invention when worm gearing P isemployed the train from the worm gear-. ing is maintained according tothis invention in contact by spring means andv if bevel and crown wheelgearing is employed, Contact would be maintained from these wheelsonwards.

In the case of ordinary gearing in the road drive train, it is advisableto hold the wheel mounted on the hubwheel drive spindle, in contact withits predecessor.

The springing of the hub wheel itself is not in a contrary direction,but in the direction of the drive when its driving source is stationary,the efi'ect being the same as back The full value of'its free movement,which is variable as required, isthus obtained.

The invention is illustrated in the accompanying drawings in whichFigure 1 is a sectional elevation of a taximeter constructed clutchdevice employed in the arrangement of Figures 3 and 4:.

Referring more particularly to Figures 1, 2, 5 and 6, 1 indicates thecasing of a taximeter 011 which is mounted the usual flag 2 whosemovements determine the setting into operation of the various parts ofthe taximeter. These parts may include a lever 3 which is adapted to beactuated by a hub wheel 4, and which effects the o aeration inter aliaof fare indication drums 5, 6, 7 and 8, which are interconnected bygearing indicated generally at 9, 10, the hub wheel a being urged by aspring 12 in the direction in which it is driven when the meter isoperative. These parts are well understood in the art, and furtherdescription thereof is believed to be unnecessary.

11 is the main spring barrel of the clockwork mechanism which can bewound up by a handle 12 and which drives a gear train comprising wheels13, 14 and 15. The gear wheel 15 is in mesh with a gear wheel 16,loosely mounted on a spindle 17 which drives the hub wheel in a mannerhereinafter described, the gear wheels 15 and 16 being formed with veryfine teeth of cycloidal or involute form. The gear wheel 16 is fast witha plate 18 freely mounted on the spindle 17 and fast with a ring-shapedmember 19 whose inner periphery is formed with a series of surfaces 20whose slope such as to form together with the periphery of a disc 21, aseries of wedge-shaped gaps. In these gaps are located hollow clutchcylinders 22, which are urged towards the narrow end of the wedge-shapedgaps by light springs 23. The cylinders may, if desired, be replaced byrollers or wedges.

The disc 21 also co-operates with a second ring-shaped member 25 to forma second series of wedge-shaped gaps, in which are located lightlyspring-pressed hollow clutch cylinders 26, this second member 25 beingsecured to a worm wheel 27 freely mounted on the spindle 17 to whichspindle the disc 21 is secured, and the two series of wedgeshaped gapsbeing separated by a division ling 28.

The angle of the sloping surfaces 20 to the tangent of the disc 21 mustlie between 8 and 12 degrees, and the inner race must be to 1 diameterfor six rollers, and to l for three rollers.

In order to maintain the gear wheels 15 and 16 in deep mesh withouthowever having very accurately to manufacture and locate the spindles onwhich they are mounted, and in order to obviate strain due to deepmeshing, the spindle 17 on which the gear wheel 16 is mounted is carriedin an arm 29 pivotally mounted at 30 and urged by a spring 31 so thatthe gear wheel 16 is maintained constantly in deep mesh with the wheel15.

The worm wheel 27 is in mesh with a worm 32 fast with a spindle 33driven in the manner referred to in connection with Figures 3 2nd 4 fromthe road wheels of the taxica In order to prevent back-lash between theworm 32 and worm wheel 27 the worm spindle 33 is pressed by a spiralspring 34 in a direction to take up wear, due to the thrust resultingfrom the transmission of the drive from the worm to the worm wheel andthe worm wheel teeth are engaged by a pawl 35 extending substantiallyradially with respect to the gear wheel 27, the free end of the pawlbeing disposed for engagement with leading tooth surfaces of the wheel,the pawl being urged in a direction substantially tangential to theperiphery of the wheel by means of a spring 36. The pawl, under the urgeof the spring 36, tends to rotate the wheel 27 in a direction oppositeto that in which it is driven by rotation of the worm. The spiral springmay be replaced by a fiat spring acting on the worm or wormshaft, andthe pawl 35 may be replaced by a strip of spring steel and the pawl orspring may be multiplied. Thus, the worm is constantly pressed forwardto obviate any lag in drive due to wear in end thrust bearing surfacesof the worm spindle, and the teeth on the worm wheel are maintainedconstantly in contact with the teeth on the worm.

The hub wheel 4 is freely mounted on the spindle 17 and is fast with aplate 1' formed with an arcuate slot 37, the effective length of whichcanbe varied by a plate 38 secured to the plate 1' by screws 39 whichcan, when slackened, move along a second arcuate slot 410 to cause theedge of the plate to blankolf more or less of the slot 37. Extendinginto the slot 37 is a pin 41, fast with a plate 12 secured to thespindle 17.

In operation, when the flag is down (i. e. in the hired position), thegear wheel 16 is constantly driven by the clock train and the worm wheel27 is driven by the worm 32 so long as the taxicab is in motion. If thetaxicab is travelling at a rate such that the road wheel drive is movingat a rate greater than that of the clock train, the worm wheel 27 willbe driven at a greater rate than the gear wheel 16, and drive will betransmitted from the wormwheeltothe spindle 17 through the hollowcylinders 26 which become wedged between the periphery of the disc 21and the surfaces 20 on the member 25. During this time, since the disc21 is rotating at a rate greater than that of (i. e. is overrunning) thegear wheel 16, the cylinders interposed between the member 19 and thedisc 21 will be idle. It, now, the taxicab stops or slows down to a ratesuch that the wheel 16 is moving at a rate greater than that of the wormwheel 27, the member secured to the gear wheel 16 will at once cause itsrollers 22 to become wedged, and thus the drive is'transmitted to thespindle 17 from the clock train, the rollers interposed between themember secured to the worm wheel 27 and the disc 21 now being idle.There is thus rovided a one-w: clutch device, in which g in taking upthe drive is very substantially .reduced. The pin 41, being at the endof the slot, due to the springing forward of the hub wheel 4 by thespring 42, is then actuated, at first idly moving in the slot until itmoves into enga ment with the end wall thereof, or with t e edge oftheplate, whereafter the drive is transmitted to the indicating andrecording mechanism in the usual way. It will, of course, be understoodthat the period of time during which the pin 41 moves idly in the slotcorresponds with the distance and/ or time period which is allowed forthe initial charge indicated immediately the flag is moved to the hiredposition.

It is usual to gear the taximcter to run slow, and in most taximctersthe apparatus consequently runs slow not onl for the initial distance ortime, but for an sequent distances or times. By the adjustment deviceaccording to this invention, which device may comprise carefully placedpins or stops, though a slot is easier to regulate, it is possible togear the taximetcr to the dead limit for distance or time, and give whatallowance is considered suitable by re lating the length of the slot, sothat for t e first unit of distance or of time the taximeter will beslow, but when the pin has idly traversed the slot, the taximeter willbe exact.

In the modification shown in Figures 3, 4 and 7, the oneway clutchdevices are mounted on two parallel shafts instead of on a single shaft,as in the arrangement of Figures 1 and'2. In this arrangement, the wormwheel 27 is fast with a gear wheel43 which, through intermediate gearwheels 44, 45 and 46, drives a gear wheel 47 securedto a spindle 48 fastwith which is the outer member 25 of one of the clutches,thecorresponding disc member 21 being loosely mounted on the spindle andfast with a gear wheel 49 in mesh with a gear wheel 50 secured to thespindle 17. The other clutch device is mounted on the spindle 17 and thedriveis transmitted from the clock train gear wheel 15 to the saidclutch'device, through a gear wheel 51 freely mounted on the spindle 48andin mesh with a gear wheel 52 freely mounted on the spindle 17 andsecured tothe ring member 19 of the clutch, the disc member 21 of whichis secured to the spindle'17. It will be understood that the disc andring members of this modification co-o rate to form wedgeshaped gaps inw ich the hollow cylinders are located.

In place of mounting the spindle 48, which carries the gear wheel 51, ona pivotally mounted lever, as in the arrangement of Figures 1 and2, thespindle is reduced at each of its ends and the reduced portions extendinto slots 53 formed in the side plates 54, 55 of the mechanism, thesprings 31 for maintaining the gear wheel 51 in mesh with the gear wheel15 being secured at one end directly to i to the post 59, and engages atits other end the teeth formed on the gear wheel 52 keeping this wheelin engagement with the wheel 51. Either strip of spring steel may bereplaced by a spring urged pawl, and either or both strips or pawls maybe multiplied on their respective Wheels. The shorter the trains of thedrives the better the taximeter functions, and the contact holdingdevices are proportional to the lengths of the trains.

The spindle 48 is driven from the road wheels of the taxicab through aone-way drive device comprising members 60, 61 which are provided withteeth so shaped as to transmit the drive in one direction, and to slipover one another when the taxicab is reversed, a spring 62 beingprovided for urging the two members towards one another, and aspring-loaded pawl 63 being provided for holding the member againstrotation when the other member 61 is reversed.

What I claim is 1. In a road wheel and clock drive device fortaximeters, the combination of gearing adapted to be driven by the roadwheel drive, clock driven gearing, an indicator device operating member,drive mechanism for transmitting drive to the operating member from thegearing driven by the road wheels or from clock driven gearing,whichever be moving at the greater rate, and individual spring means forso urging each gearing as continuously to maintain the drive mechanismassociated with each gearing free from backlash with respect to saidoperating member.

2. In a road wheel and clock drive device for taximeters, thecombination of gearing adapted to be driven by the road wheel drive,clock driven gearing, an indicator device operating member, drivemechanism for transmitting drive to the operating member from thegearing driven by the road wheels or from clock driven gearing,whichever be moving at the greater rate, spring means for maintainingthe teeth of the gearing driven occurring due to backlash in both of thegear trains.

3. In a road wheel and clock drive device for taximeters, thecombination of gearing adapted to be driven by the road wheel drive,clock driven gearing, spring means for maintaining the teeth of thegearing driven by the road wheels in contact with each other, springmeans for maintaining the gear wheels driven by the clock in contactwith each other, an indicator device operating member, a one-way drivedevice driven by the road wheel gearing and a one-way drive devicedriven by the clock driven gearing, the said drive devices transmittingdrive to the operating member from the gearing driven by the road wheelsor the clock driven gearing, whichever be moving at the greater rate.

4. In a road wheel and clock drive d vice for taximeters, thecombination of gearing adapted to be driven by the road wheel drive,clock driven gearing, spring means for maintaining the teeth of thegearing driven by the road wheels in contact with each other, springmeans for maintaining the gear wheels driven by the clock in contactwith each other, an indicator device operating member, a one-way drivedevice driven by the road wheel gearing and a one-way drive devicedriven by the clock driven gearing, the said drive devices transmittingdrive to the operating member from the gearing driven by the road wheelsor the clock driven gearing, whichever be me ing at the greater rate,and the said drive devices comprising co-operating members so shaped asto form a plurality of wedge-shaped gaps and drive transmitting memberslocated in said gaps.

5. In a road wheel and clock drive d ice for taXimeters, tne combinationof a worm adapted to be driven by the road wheel drive, spring meansurging said worm in a direc tion such as to take up wear resulting fromthe end thrust on the worm, a worm wheel in mesh with the worm, springmeans urging said worm wheel in a direction opposite to that in which itis driven by the worm to maintain said worm wheel in constant drivingcontact with said worm when the latter is moved under the urge of thefirst mentioned spring means, a clock trt in drive, a gear wheel driventhereby, spring means for maintaining the gear wheel in mesh with theclock train drive, an indicator device op erating member, a one waydrive device driven by the worm wheel and a one-way drive device drivenby the clock driven gear wheel, the said drive devices transmittingdrive to the operating member from the gearing driven by the road wheelsor the clock driven gearing, whichever be moving at the greater rate.

6. Ina road wheel and clock drive device for ta-Ximeters, thecombination of a worm adapted to be driven by the road wheel drive,spring means urging said worm in a direction suc as to take up wearresulting from the end thrust on the worm, a worm Wheel in mesh with theworm, spring means urging said worm wheel in a direction opposite tothat in which it is driven by the worm, a clock train drive, a gearwheel driven thereby, spring means for maintaining the gear wheel inmesh with the clock train drive, an indicator device operating member, aone-way drive device driven by the worm wheel and a one-way drive devicedriven by the clock driven gear wheel, the said drive devicestransmitting drive to the operating member from the gearing driven bythe road wheels or the clock driven gearing, whichever be moving at thegreater rate, and the said drive devices comprising cooperating membersso shaped as to form a plurality of wedgeshaped gaps and drivetransmitting members located in said gaps.

7. In a road wheel and clock drive device for taximeters, thecombination of a worm adapted to be driven by the road wheel drive,spring means urging said worm in a direction such as to take up wearresulting from the end thrust on the worm, a worm wheel in mesh with theworm, a spring pawl urging said worm wheel in a direction opposite tothat in which it is driven by the worm, a clock train drive, a gearwheel driven thereby, a spring pawl for urging the gear wheel in adirection opposite to that in which it is normally driven, a spindle onwhich the gear wheel is mounted, spring means for urging said spindle ina direction such that the gear wheel thereon is maintained in mesh withthe clock train drive, an indicator device operating member, a one-waydrive device driven by the worm wheel and a one-way drive device drivenby the clock driven gear wheel, the said drive devices transmittingdrive to the operating member from the gearing driven by the road wheelsor the clock driven gearing, whichever be moving at the greater rate.

R. In a road wheel and clock drive device for taximeters, thecombination of a worm adapted to be driven by the road wheel drive,spring means urging said worm in a direction such as to take up wearresulting from the end thrust on the worm, a worm wheel in mesh with theworm, spring means urging said worm wheel in a direction opposite tothat in which it is driven by the worm, a clock train drive, a gearwheel driven thereby, a spindle on which said gear wheel is mounted, apivotally mounted frame in which the spindle is mounted, spring meansfor urging said frame in a'direction such that the gear wheel thereon ismaintained in mesh with the clock train drive, an indicator deviceoperating member, a one-way drive device driven by the worm wheel and aone-way drive device driven by the clock driven gear -wiheel, the saiddrive devices transmitting driveto the operating member from the worm:wheel or fromthe wheel driven by the clock traindrive,whichever'bezmoving at the great- :er rate.

,9. iln:a roadwheeland clock drive device for ctaximeters, thecombination of gear ng adaptedtobe driven by the road Wheel drive of thetaximeter, spring means urging said gearingrso as to maintain the teethof the gearing "in contact with each other a ring member-driven by saidearing, a spindle, a disc :fasttherewith, the dlSC'fiIld ring memberco-operatingito provide wedge-shaped gaps, drive transmitting memberslocated in said gaps, a second ring shaped member co-operat- :ing withthe disc to form an additional series of wedge-shaped gaps, additionaldrivetransmitting members located in said additional gaps, agearwheelfastwithsaid second ringshaped member, a clock train drive, spr ng meansfor urging the spindle in a direction such that the said vgear wheel ismaintained inieonstant engagement with the clock train 1 drive, anda'hub wheel driven by said spindle.

10. In a road wheel and clock drive device :for taximeters, thecombination of a worm adapted to be'driven by the road wheel dr ve,springmeans urgingsaid worm in a direction such as to take up wearresulting from the end thrust on the worm, a worm wheel 1n mesh with theworm, a spring pawlurging said worm wheel in a direction opposite tothat in which it is driven by the worm, a ring member driven by saidwheel, a spindle, a-disc fast therewith, the, disc and ring memberco-operating to provide wedge-shaped gaps, drive transmitting memberslocated 1n said gaps, a second ring shaped member cooperating with thedisc to form an additional seriescfwedge-shaped gaps, additional drivetransmitting members located in said additionalgaps, a gear .wheel fastwith said second ring-shaped member, a clock train drive, spring meansfor urgingthe spindle in a direction such that the said gear wheel ismaintained in constant engagement with the clock train drive, and a hubwheel driven by said spindle.

11. In a road wheel and clock drive device for taximeters, thecombination of a worm adapted to be driven by the road wheel drive ofthe taximeter, a spring urging said worm in an axial direction such asto take up wear thereof, a worm wheel in mesh with said worm, springmeans urging said wheel in a direction opposite to that in which it isdriven by the worm, a ring member driven by said worm wheel, a spindle,a disc fast with said spindle, the disc and ring member co'operating toprovide wedge-shaped gaps, cylinders located in said gaps, a secondring-shaped member co-operating with the disc to form an additionalseries of wedge-shaped gaps, ad-

ditional cylinders located in said additional gaps, a rear wheel fastwith said second ringshaped member, a clock train dr1ve,-spr1ng meansurging the spindle in adirection such that the gear wheel is maintainedin constant engagement with the clock train drive,'a-hub mining theefi'ective length of the slot,'and

means for adjustingthe plate, and-a spring urging said hub wheel in thedirection in which it is driven'by the transmitting-means.

12. In a road wheel and clock drive device for taximeters, thecombination of a worm adapted to be driven by the road 'wheel'drive ofthe taximeter, a spring urging said worm in an axial direction such astotake up wear thereof, a worm wheel in mesh with said worm, springmeans urging said wheel in a direction opposite to that in which it isdriven by the worm, a ring member driven'by said wheel, a spindle, adisc fast therewith, the disc and ring member co-operating to providewedgeshaped gaps, cylinders located in said gaps, a second ring-shapedmember co-operating with the disc to form'an additional series ofwedge-shaped gaps, additional cylinders located in said additional gaps,a gear wheel fast with said secondring-shaped member, a clock traindrive, spring means for urging the spindle in a direction such'that thegear wheel is maintained in constant engagement with the cloclctraindrive, a hub wheel freely mounted on saidspindle, means for transmittingthe drive from the spindle to the hub wheel comprising a pin andslot'connection device, a plate for determining the effective length oftheslot, and means for adjusting the plate, and'a spring urging the hubwheel in the direction in which it is driven by the transmitting means.

13. In a taximeter, aroad wheel driven gearing, motor driven gearing, aspindle,-registering means driven bythe spindle,a,gear journaled on saidspindle and in mesh with one of said gearings, means whereby the spindlemay bodily move toward the last mentioned gearing to correspondinglymove said gear, a plate driven by the gear capableof movementindependently of the spindle, a plate driven by the other gearingcapableof movement independently of the spindle, and clutch means-between saidplates and spindle to transmit drive to thespindle according towhichever plate is moving at the greaterrate.

14. In a taximeter, a road wheel driven gearing, motor drivengearing,a-spindle,register mechanism driven by the spindle, agearjournaled on said spindle and in mesh with one of said gearings, meanswherebyzthespindle may bodily move toward the last mentioned gearingtocorrespondi-ngly move said gear,.a plate griven by the gear capable ofmovement independently of the spindle,

means urging movement of the latter gearing to take up lag andcompensate for movement of the spindle and gear, a plate driven by theother gearing capable of movement independently of the spindle, andclutch means between said plates and spindle to transmit drive to thespindle according to whichever plate is moving at the greater rate.

15. In a taximeter, a road wheel driven gearing, motor driven gearing, aregister mechanism driven by both of said gearings, aone way clutchdevice in each gearing to transmit drive to the register mechanismaccording to whichever gearing is moving at the greater rate, and meansurging relative movement of parts in each gearing to prevent lag of saidregister mechanism with respect to both gearings otherwise occurring dueto backlash in said gearings.

16. In a road wheel and clock drive device for taximeters, thecombination of gearing adapted to be driven by the road wheel drive,clock driven gearing, an indicator device operating member, drivemechanism for transmitting drive to the operating member from thegearing driven by the road wheels or from clock driven gearing,whichever be moving at the greater rate, spring means for maintainingthe teeth of the gearing driven by the road wheels in contact with eachother, and spring means for maintaining the gear wheels driven by theclock in contact with each other so as to prevent lag in operation ofsaid drive mechanism otherwise occurring due to backlash in both of thegear trains, one of said spring means being mounted to exert a thrustupon the teeth of a gear wheel in a direction substantially tangentialto the periphery of said wheel.

17. In a taximeter, a road wheel driven gearing, motor driven gearing, aregister mechanism driven by both of said gearing, a one way clutchdevice in each gearing to transmit drive to the register mechanismaccording to whichever gearing is moving at the greater rate, and meansurging relative movement of parts in each gearing to prevent lag of saidregister mechanism with respect to both gearings otherwise occurring dueto backlash in said gearings, said means including a pawl extendingsubstantially radially of a gear wheel in one of said gearings, the freeend of the pawl being disposed for engagement with leading toothsurfaces of said gear wheel, and a spring for urging the nose of saidpawl in a direction substantially tangential to the periphery of saidgear wheel and opposite to its direction of movement.

. both of said bearings, a one way clutch device in each gearing totransmit drive to,

the register mechanism according to whichever gearing is moving at thegreater rate, and means urging relative movement of parts in eachgearing to prevent lag of said register mechanism with respect to bothgearings otherwise occurring due to backlash in said gearings, the meansurging relative move ment of the parts in the road wheel driven gearingincluding a pawl extending substantially radially of said worm wheel andhaving its free end disposed for engagement with leading tooth surfacesof said worm wheel, a spring for urging the nose of said pawl in adirection substantially tangential to the periphery of said worm wheeland opposite to its direction of movement, and a spring for urging saidworm into contact with said thrust bearing.

19. In a road wheel and clock drive device for taximeters, thecombination of gearing adapted to be driven by the road wheel drive,clock driven gearing, an indicator device operating member, drivemechanisn for transmitting drive to the operating member from thegearing driven by the road wheels or from clock driven gearing,whichever be moving at the greater rate, spring means mounted to exert athrust upon the teeth of a gear wheel in the road wheel drive gearing ina direction substantially tangential to the periphery of said wheel formaintaining the teeth of the gearing driven by the road wheels incontact with each other, and spring means mounted to exert a thrust uponthe teeth of a gear wheel of the clock driven gearing in a directionsubstantially tangential to the periphery of said wheel for maintainingthe gear wheels driven by the clock in contact with each other so as toprevent lag in operation of said drive mechanism otherwise occurring dueto backlash in both of the gear trains.

In testimony that I claim the foregoing as my invention, I have signedmy name this 28th day of May, 1930.

FRANK HAROLD CLAUSE.

